Move all user information commands to /whois 

The following commands are now aliases of /whois:
/ip, /getip, /rooms, /altcheck, /alt, /alts, /getalts.
Whois now provides alt information of an user.
In due time the aliases will be deprecated and removed. This is meant to centralise user information seeking in /whois, which has all the information available.
Merge pull request #214 from Joimer/patch-15

Move all user information commands to /whois